Abstract: A toner including toner particles comprising a binder resin, a coloring agent and a wax. The toner particles are prepared by agglomerating and/or fusing at least two kinds of resin particulates and particles of the coloring agent dispersed in an aqueous medium. A first resin particulate among the at least two kinds of resin particulates contains a resin having a polyester skeleton and the wax. At least 50% by weight of the binder resin is polyester resins.

Abstract: An image forming method, including charging a photoreceptor with a charger contacting thereto; irradiating the photoreceptor to form an electrostatic latent image thereon; developing the electrostatic latent image with a toner to form a toner image on the photoreceptor; transferring the toner image onto a recording material directly or through an intermediate transferer; and fixing the toner image on the recording material, wherein the toner includes a binder resin; a colorant; a composition having a low softening point; and an external additive, and wherein a surface resistivity Rse [?] of the charger and a volume resistivity Rsw [?·cm] of the composition having a low softening point satisfy the following relationship: 0.8×10?1 Rse<Rvw<1.5×10 Rse.

Abstract: To provide an image forming apparatus using a toner having inorganic fine particles externally added thereto, wherein a detached ratio R1 of the inorganic fine particles from the non-transferred toner is from 0% to 20%, a detached ratio R2 of the inorganic fine particles from toner passed through the collecting unit is from 20% to 80%, and a ratio of the detached ratio R2 to the detached ratio R1, R2/R1, is 1.5 or more.

Abstract: A toner including toner particles including a binder resin, and a colorant, and an external additive present on a surface of the toner particles, wherein the external additive includes a silica having an average primary particle diameter of from 100 to 500 nm and a BET specific surface area of from 800 to 1000 m2/g. An image forming method including forming an electrostatic image on an image bearing member; developing the electrostatic image with the toner to form a toner image; and transferring the toner image on to a receiving material. An image forming apparatus including an image bearing member bearing an electrostatic image; a developing device developing an electrostatic image with the toner to form a toner image on the image bearing member; a transfer device transferring the toner image to a receiving material; and a fixing device fixing the toner image on the receiving material.

Abstract: The present invention provides a developing device that allows for maintaining the conveyance amount of a toner within a certain definite range. A developing device 12 of the present invention is provided with a toner conveying unit 13 configured to convey a fist toner and a controlling member 15 configured to control the thickness of a toner layer formed with the first toner conveyed by the toner conveying unit 13, wherein a second toner provided with a charged amount per unit mass that differs from a charged amount per unit mass of the first toner is applied over the surface of the controlling member 15.

Abstract: An oilless-fixing toner is provided for use in a vertical image developer including a toner feeder feeding the oilless-fixing toner vertically below; a developing roller located vertically below the toner feeder; and a screw blade agitating the oilless-fixing toner, wherein the oilless-fixing toner contains: a resin including a wax; a colorant; and an external additive, wherein a total energy determined from a torque and a load of the screw blade is from 450 to 530 mJ when rotating in the oilless-fixing toner at 100 mm/s, and a ratio of total energy at 10 mm/s to total energy at 100 mm/s is from 2.0 to 3.0.

Abstract: A cleaning device equipped with an elastic blade configured to make contact with an image bearing member to remove a toner remaining on the surface of an image bearing member, wherein the toner comprises at least a releasing agent in toner particles and at least two or more external additives of a first external additive composed of a hydrophobic silica having an average particle diameter of 5 nm to 30 nm and a second external additive composed of a hydrophobic silica having an average particle diameter of 60 nm to 300 nm, and has an average circularity of 0.880 to 0.935; the rebound elasticity modulus of an elastic material used for the elastic blade making contact with the image bearing member is 35% or more under the condition of 25° C, and the number of vibrations at the blade edge is 2.0 kHz to 4.0 kHz.

Abstract: To provide a pulverized toner excellent in the releasing ability and cleaning ability, and an image-forming apparatus for one-component developer, and a process cartridge using the pulverized toner. The pulverized toner contains a toner base particle containing at least a binder resin, a colorant, and a releasing agent, the mass ratio of the releasing agent to the binder resin is 3.0% to 6.0%, the adhesive force among the pulverized toners at 25° C. to 55° C. is 20 g to 80 g, and the pulverized toner is used for the image-forming apparatus for one-component developer containing the cleaning unit configured to dispose an elastic blade adjacent to the surface of the image bearing member so as to clean the surface.

Abstract: Toner for electrostatic charge development wherein no scumming occurs, and toner leakage caused by charge defect of the toner on a developing roller can be inhibited, and an excellent image stability is obtained is provided.

Abstract: A toner including toner particles including a binder resin, a colorant and a release agent, and an external additive including a first particulate inorganic material having a formula of MgxSiyOx+2y where each of x and y is an integer, and a number average secondary particle diameter of from 0.02 ?m to 2 ?m, wherein the first atomic ratio (Mg/Si) s in a surface portion of the first particulate inorganic material is not greater than (preferably less than) the second atomic ratio (Mg/Si)e in the entire first particulate inorganic material. Alternatively, a toner including toner particles including a binder resin and a colorant, and an external additive which includes a particulate inorganic material having a formula of MgxSiyOx+2y where each of x and y is an integer and which has a surface treated with a fatty acid.

Abstract: A toner is provided including a binder resin, a colorant, and a release agent, which has a volume average particle diameter (Dv) of from 3 to 9 ?m, and wherein the binder resin and the release agent form a sea-island structure in which the island formed of the release agent is dispersed in the sea formed of the binder resin in a cross-sectional image of the toner obtained by a transmission electron microscope (TEM), and the following relationships are satisfied: IB>IA and IB>IC, wherein each of IA, IB, and IC represents an area ratio (%) of the island in an outermost region (A) of the cross-sectional image of the toner, an intermediate region (B) thereof located under the outermost region (A), and an innermost region (C) thereof located under the intermediate region (B); and a method of preparing the toner.

Abstract: A toner kit containing at least a black toner, a yellow toner, a magenta toner and a cyan toner, wherein these toners have at least the binder resin, the colorant and the charge controlling agent having the molecular structure containing K+ as the counterion, when the K+ intensity detected by the fluorescent X ray on the surface of the black toner is Kk, the K+ intensity detected by the fluorescent X ray on the surface of the yellow toner is Ky, the K+ intensity detected by the fluorescent X ray on the surface of the magenta toner is Km and the K+ intensity detected by the fluorescent X ray on the surface of the cyan toner is Kc, the following formulae: Kk<Ky, Kk<Km and Kk<Kc are fulfilled is provided.

Abstract: To provide a toner containing at least a toner base containing a binder resin and a colorant, and an inorganic fine particle, wherein the inorganic fine particle contains a compound oxide expressed by the following Composition Formula (1): [M1]aSibOc??Composition Formula (1) where “M1” represents a metal element selected from Sr, Mg, Zn, Co, Mn and Ce, “a” and “b” each represents an integer of 1 to 9 and “c” represents an integer of 3 to 9, wherein an average primary particle diameter of the compound oxide is 0.02 ?m to 1.5 ?m, and an average secondary particle diameter of the compound oxide is 0.08 ?m to 3.5 ?m, where the secondary particle is an aggregate of the primary particles.